TROUBLEShOOTING | ||
| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS
(SYMPTOMS)
POSSIBLE CAUSE
REMEDY
PROBLEMS
Poor arc striking with sticking or | 1. Improper procedures of tech- | 1. See “Gas Metal Arc Welding |
niques. | Guide” (GS100). | |
and ropy looking bead, or electrode |
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stubbing into plate while welding. | 2. Improper gas shielding. | 2. Clean gas cone. Make certain that |
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| gas diffuser is not restricted. Make |
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| certain that gas cylinder is not |
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| empty or turned off. Make certain |
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| gas solenoid valve is operating |
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| and gas flow rate is proper. |
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| 3.Remove gun liner and check rub- |
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| ber seal for any sign of deteriora- |
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| tion or damage. Be sure set screw |
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| in brass connector is in place and |
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| tightened against the liner bush- |
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| ing. |
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Tip seizing in diffuser. | 1. Tip overheating due to prolonged | 1. Do not exceed current and duty |
| or excessive high current and/or | cycle rating of gun. |
| duty cycle welding. |
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| 2. A light application of high temper- |
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| ature antiseize lubricant (such as |
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| Lincoln E2067 Graphite Grease) |
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| may be applied to tip threads. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MAGNUM® PRO 250, 350, 450 & 550 AMP
